Astudent is asked to calculate the value of 752 − 702 using the identity x2 − y2 = (x − y)(x + y). the student's steps are shown below.

step 1: 752 − 702 = (75 − 70)(75 + 70)

step 2: = (5)(155)

step 3: = (5)(150) + 5(5)

step 4: = 750 + 25

step 5: = 775

the correct answer should be 725. in which step did the student make his first error?
step 1
step 2
step 3

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

d

step-by-step explanation: